Question

[(3-¹.3³)-¹]-² simplifique as expressoes

Answer 1

$\left[\left(3^{-1}\cdot3^3\right)^{-1}\right]^{-2}=\\\\\left[\left(3^{-1+3}\right)^{-1}\right]^{-2}=\\\\\left[\left(3^2\right)^{-1}\right]^{-2}=\\\\\left(3^{-2}\right)^{-2}=\\\\3^4=\\\\\boxed{81}$